To put things simple, I'd definitely recommend this book to any parent. And I'm sure I'll reread this book, most likely several times.
Now, a bit more extended opinion.
My little princess is just 3,5 year old yet and there is not much in the book that can be directly applied at this age. But I'm glad that I already read the book - now I'm better prepared for coming years.
The book is not about fathers of daughters only - it's a good read for all parents. And even more - it's not only about parenting - it's also about how to become better person.
The concepts presented in the book are pretty much "simple concepts", but you often don't really need complex things to become better in something - there is no need to complicate things.
And there are not 1 or 2 thoughts discussed in the book - there are many of them. And, while simple and important, those points are not often thought about/risen in the modern society. That's why I'm going to reread the book later.
As for the downsides - there are some, but they're minor, as I see it First, for me there are too much "stats and facts" - I don't believe in these things and just passed through the sections containing it. Also the book sometimes feels not so structured (things about Y gets discussed in chapter on X), but I tend to consider it as a good thing - things just get repeated (often from the different perspective) and you can remember and/or understand better. The last thing I didn't particularly like - author is too much concentrated on sex aspects, putting sex in a very negative light. Perhaps she intentionally exaggerated her opinion to get more attention and make parents think more about this, since it's a really very important subject. If so, it worked, at least for me.